[Mesa-dev] [Bug 89642] dEQP-GLES3: dEQP-GLES3.functional.shaders.preprocessor.predefined_macros.line_2_vertex fails because of wrong __LINE__ values

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89642

            Bug ID: 89642
           Summary: dEQP-GLES3:
                    dEQP-GLES3.functional.shaders.preprocessor.predefined_
                    macros.line_2_vertex fails because of wrong __LINE__
                    values
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: siglesias at igalia.com
        QA Contact: mesa-dev at lists.freedesktop.org

DEQP failed test:

dEQP-GLES3.functional.shaders.preprocessor.predefined_macros.line_2_vertex

-------

The test does a complex __LINE__ macro replacement. The shaders are created
from the following template in modules/gles3/gles3/shader/preprocessor.test
file:
         #version 300 es
         precision mediump float;
         ${DECLARATIONS:single-line}
         #define BBB      __LINE__, /*
            */ __LINE__
         #define AAA(a,b) BBB, a, b

         void main()
         {
            out0 = vec4(AAA(__LINE__,
                  __LINE__
                  ));
            ${OUTPUT}
         }

It expects to have out0 filled with (12, 12, 10, 11) values. Mesa gives (4, 5,
10, 11). I created a C program that mimics the shader (because Mesa follows a
draft of C99 standard, see src/glsl/glcpp/README) but I got different results
depending of which C compiler was used:

* gcc --std=c99 (or without c99, it doesn't matter) prints: 12, 12, 12, 12
* clang prints: 12, 12, 10, 11.

Mesa calculates the LINE macro values as the line numbers of where the macro is
seen in the code before doing any expansion, as special case in glcpp-parse.y,
function _glcpp_parser_expand_node().

-------

Tested on Haswell with Mesa master: 27bf37ba05b69ebf6f373d1637a26b4839265921

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